[PATCH] D11568: fix memcpy/memset/memmove lowering when optimizing for size

[Sanjay Patel]

spatel created this revision.
spatel added reviewers: qcolombet, hfinkel, mkuper.
spatel added a subscriber: llvm-commits.

Fixing MinSize attribute handling was discussed in D11363. This is a prerequisite patch to doing that.

The handling of OptSize when lowering mem* functions was broken on Darwin because it wants to ignore -Os for these cases, but the existing logic also made it ignore -Oz (MinSize).

The Linux change demonstrates a widespread problem. The backend doesn't recognize the MinSize attribute by itself; it assumes that MinSize implies OptSize. Fixing this more generally will be a follow-on patch or two.

http://reviews.llvm.org/D11568

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/memcpy.ll

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